Machine for grinding crank pins



Feb. 7, 1928. 1,658,539

P. STONER MACHINE FOR GRINDING CRANK PINS Filed Jan.13, 1922 5 Sheets-Sheet l Paul Sinner Feb. 7, 1928.

P. STONER MACHINE FOR GRINDING CRANK PINS Filed Jan.l3. 1922 5 Sheets-Sheet jwvw If 0': Paul Sinner Aw M I gi l Feb. 7, 1928.

1,658,539 P STONER MACHINE FOR GRINDING CRANK PINS Filed Jan.l3. 1922 5 Sheets-Sheet 4 W EV E522;

vvv c I No:- Paul Stone!" Feb. 7, 1928.

P. STONER MACHINE FOR GRINDING CRANK PINS Filed Jan.l3, 1922 5 Sheets-Sheet 5 llllL mm- L- m .u l l l l lwvadoz Paul Stoner ,Paenaa Feb. 1,1928.

UNITED STATESPATENT OFFICE;

PAUL STONER, OF WAYNESBQRO, PENNSYLVANIA, ASSIGNOR TO LANDIS TOOL COM- BANY, OF WAYNESBORO, PENNSYLVANIA, A CORPORATION 015 PENNSYLVANIA.

mnciamn ron on'mnmc ennui: rms.

Application med January 13," 19 22. Serial No. 528,999.

My said invention "relates to'a grinding machine intended primarily for grinding crank pins but not limited thereto, and it is an object of the same to provide a machine of the characterdescribed which shall have means, for ready adjustment to grind pins of crankshafts of varying throw.

Another object is to provide means for centering the individual crank-pins.

quickl 0 'A filrther ob ect of the-inventlon is to provide an improved yielding bearing for the tail stock of the machine.

Other objects are to provide an improved work rest on which may belocated an improvedwheel truing device or a crank-pin centering device. 1

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a front elevation of the ma chine,

Figure 2 an enlarged iew of the tail stock, partly in section, Figure 3 "an end view of the head stock crank carrying fixture y Figure 4 a vertical section on line 4-4 of Figure 3,

Fi re 5 a of Flgure 3, I v f Figurefi a face view of the tail stock crank carrying fixture, Figure 7 a horizontal section on line 7-7 of Figure 6f FigureB a vertical section on line 8'8 of Figure 6, v

Figure 9 an end elevation of a work rest carrying a wheel truing device,

Figure 10 a plan view looking 'down from line 10- 10 of Figure 9,

' Figure 11 a section on line 11-11 of Figure 9,

Figure 12 a section on line 12- -12 of Figure 9,'and v Figure 13 is a detail view similar-to Figure 9 showing a crank-pin centering dev1ce on the support in place of the wheel truing device. r

In the drawings reference character A indicates the main frame of the machine on which are located a grinding wheel carriage B adapted-to be moved longitudinally and transversely of the main frame, a head stock C and a tail stock I), together with various horizontal section on line 5-5 i other mechanisms forming no part of the present invention. i

\ The head stock by a pulley 20 and a head 21 having parallel flanges 22 on which is mounted a transversely slidable body 23 forming a support for a chuck 24; The slidable body 23 is held in C carries a spindle driven place on the flanges by means of clamp bars, I

ery. At the lower end the shaft extends through a washer 32 resting against boss 29'. A collar 33 is pinned tothe shaft at 34 and a pa1r of locking screws 35 adapted to bear against the washer'serve to hold the shaft against rotation and to take up any lost motion between the parts.

Tapering shims or wedg 36 are placed between the flanges 22 and overhanging parts of the body 23 to compensate for wear.

The shim at the are side in Figure 3 is (held in fixed position by a pin 37 threaded into a hole in the body 23 or otherwise fixed thereto. The right-hand shim is adjustable transversely of the head by means of a pair of set screws 38 and 39.; The set screw 39 may be actuated to move the shim 36 up,-

ward to compensate for wear, the set screw 38 acting as a limit stop. When proper adjustment has been made by-manipulation of the two set screws they are both set u against the shim and mutually lock, eac other against rotation. A pair of limiting screws 40 arelocated to extend at their inner edge underneath the broad flat heads of screws 38 and 39 to prevent binding of said screws and insure against possible distortion thereof.

The body 23 of the chuck-carrier has on its fac .a circular pad il with three holes 42 equzilly spaced from the center of the pad and from each other for attachment of a chuck .having jaws 24, which may be a erence to the body 23 and opposed thereto is 'scroll chuck of ordinary type. The position a counterweight 43. If required a plurality of counterweights may be used as indicated in Figure 1, they being attached to the movable head by screws 41'.

The tail stock is similar in structure to the head stock, its spindle having a fixed head 44 on which is mounted a transversely adjustable head 45 having a pad 46 with spaced openings, an adjusting screw 47 for moving the adjustable head and its chuck transversely of the fixed head, and wedges 48 and 49 for taking up wear as in the head stock.

The tail stock has improved bearing devices for the spindle as shown in Figure 2. The spindle 50 is carried in a sleeve 51 having at its outer end an enlargement 52 in which is located a ball or roller bearing 53, the ball or roller bearing being in front of an annular flange 54 on the spindle. At the rear of the flange is a bushing 55 in the bore of the sleeve which at the rear of the spindle is contracted to hold a nut 56 in rear of which the sleeve is again enlarged. The nut 56 is engaged by a left-handed screw thread at 57 on a rod or spindle 58 adapted at its inner end to enter an opening in the spindle 50. An abutment, here shown as a nut 59, surrounds the spindle 58 and has threaded engagement with the frame of the tail stock.

A sleeve 60 rotatably mounted in the nut 59 has a spline engaging a groove in the rod 58 to permit the rod to slide through the nut. In front of the nut 59 is an externally threaded sleeve 61 having a flange at its rear end bearing against the nut 59 and carrying a nut 62 for adjustment of the tension of a spring 63 bearing at one end against nut 62- and at the other against an annular flange 64 on rod 58. The function of this spring is to maintain a yieldable tension on the work carrying centers in doing ordinary grinding, the spindle 51 being then replaced by an ordinary 60 work carrying center.

A slidable rod 65 having a handle portion 66 is mounted in the tail stock frame and its beveled forward end is adapted to engage a ring 67 on the fixed head of the rotary spindle to lock the device with the chuck holding jaws in uppermost position. A similar device for holding the front chuck in alinement with the rear one is shown at 68.

Directly in front of the grinding wheel is located a support 69 or several such supports may be located at spaced intervals along the front side of the machine frame. This support has pivoted thereto an adjustablymounted work-enga 'ng device 70 and slidably mounted therein is a second work-engliligin device 71. A screw shaft 72 having .t ea ed engagement with the internallythreaded sleeve 76 serves to vary the position of the work rest 70. The sleeve 76 is held in place by a pin 77 against the force of a spring 75. The pin passes through a sleeve 79-held in adjusted position by set screw 80, and has a neck engaged by a leaf spring 78 which normally holds the pin in locking position. In a cored-out recess of sleeve 76 is located a nut 73 having threaded engagement with shaft 72 and having a pin 73 engaging a groove in sleeve 76 to prevent relative rotation. A spring 74 in the recess back of nut 73 acts to take up wear on the screw-threads and to prevent rotation of shaft 72 due to vibration. A collar 81 having an extension with a hole cngageable by a spring-pressed detcnt 82 prevents accidental rotation of the screw 72.

The rigid work rest 71 has a square head and a round stem 71 separate from the head and slid-ably mounted in the frame 69. The stemis held from rotating by a screw 83, so as to keep the long face of the rest against the work. At the rear end of the member 71 is a threaded rod 84 adapted for manual adjustment and normally held against rotation by a collar 85 having an opening engaged by a spring-pressed detent 86 (Figure 10). j

At the top of the frame 69 is a fin 86 cut away to provide a rearward extension and also cut away at 88. In F igure 9 a wheel truing device is shown as mounted on this fin, the truing device comprising a curved frame 89 having a pair of downwardly extendingflanges held in the proper relation by a clamping screw 90 passing through them. A pin 91 engages under the rearward extension, the entire truing device being comparatively small and light so that a workman can pick it up and place it in position on the machine pushing it forward until the pin 91 engages underneath the extension 87. The truing device comprises a diamond holder 92 fora diamond 93 and operating and positioning devices therefor similar to those disclosed in the patent to Shearer, 1,200,768, October 10, 1916.

Alternatively with the wheel truing device a crank-pin alining device may be 0- sitioned on the fin 86. The latter device as depending flanges through which extends a pin 99. A spacer is located between the flanges and about the in 99 and the spacer has a fiat forward ace adapted to rest against the rear face of the fin 86. The body 101 of the aligning device has a slot at 102 for enabling the operator to grasp the device readily and to hold it in position. At the forward end is a shaft 103 freely movable up and down and held from rotation by means of a spline at 104, said shaft having alpin 105 to limit downward movement.

It wi be obvious that a crankpin slightly out of position will be aligned by the diverg'ing lugs 106 on the shaft.

nuance In the operation of my device a, crankshaft is located in the jaws of the left hand chuck, the right-hand chuck bein retracted by means of'thehand wheel 58' i necessary against the force of the spring 63. It will be seen that the sleeve 51 may be adjusted to vary the Position of the chuck by turningthe handwheel 58 and that said sleeve handwheel in a clockwise direction.

. on fin 86 and the crankpinspsuccessively alignedin position to be 'ground. In a crankshaft for, a six-cylinder engine two ins will be aligned simultaneously and the w eel may be moved from one to the other if desired so as to grind both of the alined pins before again adjusting thecrankshaft.

While I have illustrated and described a preferred form of my invention, 'it will be obvious to those skilled in the art that manymodifications of, said form may be madd shaft slidably mounted in a bearing on said without departing from the spirit of the invention, and I desire to claim as my ownall such modified forms the true scope of the invention being indicated, in the appended claims. 7

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1; In a crank rinder, means for supportin a crankshaft, a grinding wheel at one "si e of the crank shaft, a support at the other side thereof having an upstanding fin,

said fin having a flat rear face and being undercut beneath said face and a crank aligning means adapted to rest on sa'i support and having a face adapted 0 rest against the rear face of said fin, J bstantially asset forth. i

2. Ina crank grinder, means for supportinga crank shaft, a grinding wheel at .jacent a crankshaft supporte one side of the crank shaft, 9. support at' the otherside, and a crank aligning device adapted to be positioned on said support, said device comprising a body and a verti-. calliy" movable shaft slidable in said body,

shaft having diverging projections at its lower end, su stantially as set forth.

3. In a crank grinder, head and foot stocks, radially adjustable chucks thereon, a\Y-shaped crank-alining device, and means to support the same in inverted osition ad-' by said chucks, substantially as setfOrth;

4. In a crank' rinder, head and foot stocks, radially ad ustable chucks thereon, and a bifurcated 'crank-alinin device mounted for free movement radially of the crankshaft, substantially as set forth;

rest and means 5. In a crank grinding machine, a pivoted work rest bearing a ainst one side of acrank pin, a rotary threa ed shaft bearing against the pivoted work rest, a sleeve havin threaded engagement with the shaft said sleeve and shaft being slidable in unison on the machine frame, a spring bearing against the inner end of the sleeve, andmeans for holding the sleeve and shaft in place against the tension of the spring, substantially as set forth.

6. In a crank grinding machine; a pivoted I work rest and means for adjustably supporting the same comprising a rotary shaft, a sleeve entering a chamber in the support, a

spring within the chamber tending to force.

said sleeve and shaft away from said piv-' oted workvrest, means to hold the sleeve in place, a nut also within the sleeve and hav ing engagement therewith to prevent rotation of the nut "and a spring between one .end of the nut an e adjacent end of the sleeve, substantially as et forth.

'7. In a grinding machine, a support, a pivoted work rest and means for adjustably supporting the same comprising a rotary support, asleeve slidable in said bearing said sleeve having threaded engagement with the shaft, a detent for holding the sleeve in place, and means acting yieldmgl on the shaft to 'prevent rotation thereo substantially as set forth.

8. In a grindin or adjustably supporting the same comprising a rotary threaded shaft,

a nut therefor in a chamber on the support,

a threaded sleeve entering the chamber and forming a nut for the shaft and having means to prevent rotation of the first-named nut, and a yieldin detent engaging the sleeve to hold it in forth.

9. In a rinding machine, a rest,'a shaIt bearing at one en agamst said work rest, asleeve slidable in a chamber on the machine frame with said shaft said shaft being adjustably secured ,to said sleeve, means to force the sleeve and shaft yieldably away from the work rest, and means for holdin them in place against the action (fif szid yie dable means, substantially as set ort 10. In a grinding machine, a pivoted work rest, a'shaft bearing at one end against machine, a pivoted work ivoted work' p ace, substantially as set rest, a rotary threaded shaft bearing against the tension of the spring, substantially as the pivoted work rest, a sleeve having set forth. threaded engagement with the shaft said In witness whereof, I have hereunto set If sleeve and shaft being slidable in unison on my hand at Waynesboro, Pennsylvania, this 5 the machine frame, a spring bearing against 31st day of December, A. D. nineteen hun the inner end of the sleeve,- and means for dred and twenty-one. holding the sleeve and shaft in place against PAUL STONER. 

